MMX BMW G80/G81 M3 & G82/G83 M4 S58 Engine Power Control Module

Unlock the full potential of your BMW G80/G81 M3 or G82/G83 M4 with the MMX Power Control Module (PCM) – a plug-and-play performance upgrade that delivers huge gains in power and torque while remaining removable and undetectable.

Developed as a smarter alternative to ECU tuning, the PCM works in parallel with the factory ECU, using MMX’s in-house developed calibration on a standalone PCB. By safely optimising multiple sensor signals – including charge air pressure, fuelling, and ignition – the PCM delivers seamless, reliable gains across the entire powerband.

After 12 months of development and tens of thousands of dyno, road, and track miles, the PCM has been fine-tuned to achieve the perfect balance of performance, drivability, and engine safety. Unlike basic tuning boxes, it acts much closer to a secondary ECU, offering precision control and OE-level integration.

Each unit is housed in a billet aluminium case, anodised in MMX’s signature gloss black for durability, with finned cooling for reliability under load. A carbon fibre mounting bracket and vehicle-specific loom ensure a perfect fit and simple installation.

Key Features:

• Plug-and-play Power Control Module for G8X S58 engines

• Gains of up to:

  • Standard M3: 550 hp & 650 Nm

  • Competition, LCI & CS/CSL models: 650 hp & 750 Nm

• Acts as a secondary ECU, not a simple tuning box

• Optimises multiple channels in real time (ignition, fuelling, boost)

• Removable and undetectable – warranty friendly

• Developed with extensive dyno, road & track testing

• CNC-machined billet aluminium housing, anodised gloss black

• Carbon fibre mounting bracket for secure installation

• Includes vehicle-specific wiring loom for OE-quality fit

• Engineered and hand-assembled in the UK

• Calibrated in-house by MMX for performance and reliability

Compatibility:

• BMW G80 M3 Saloon (2021+)

• BMW G81 M3 Touring (2023+)

• BMW G82 M4 Coupe (2021+)

• BMW G83 M4 Convertible (2021+)

Unlock a new level of performance with the MMX PCM for BMW G80/G81 M3 & G82/G83 M4 – the smart, safe, and powerful plug-and-play solution for your S58 engine.

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.